public void CompareStrings_WhenItReceivesTwoStrings_ItReturnsThemWhenTheyDiffer() { // Arrange var expectedResult = "pear, peach\n"; // Act var result = _comparer.CompareStrings("pear", "peach"); var result2 = _comparer.CompareStrings("banana", "banana"); // Assert Assert.That(result, Is.EqualTo(expectedResult)); Assert.That(result2, Is.Empty); }